CRANBERRY TWP — More than 1,300 employees evacuated a building at Westinghouse Electric Co.’s headquarters Tuesday afternoon after a computer malfunction created smoke on the second floor. Vaughn Gilbert, the director of communications for the company, said the incident affected only the second floor of Building One on the large campus, which has four buildings. Those displaced employees only waited about 30 minutes before being let back inside about 2:30 p.m. “There was only a minimal amount of smoke,” Gilbert said, adding that there wasn’t any damage. “But we decided to do the safe thing and get everyone out.” Mark Nanna, the assistant administrator for the township’s fire company, said his crew did little at the business besides go in and check out the source of the smoke. “And there wasn’t really much smoke,” he said. Fire crews from Adams, Cranberry and Marshall townships responded to the call just before 2 p.m.